Heap Buffer Overread in wolfSSL PKCS7 Parser

Mitigation Strategies

Immediate mitigation involves updating wolfSSL to a version that includes the fix for this vulnerability.

According to Resource 1, the issue was addressed in a pull request merged on April 23, 2026, which added bounds checking and NULL pointer checks to prevent the vulnerability.

Therefore, applying the patch from PR #10128 or upgrading to a wolfSSL version that contains this fix is recommended.

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Executive Summary

This vulnerability is a heap buffer overread occurring in the function wc_PKCS7_DecodeEnvelopedData when it parses specially crafted PKCS7 EnvelopedData. An attacker could exploit this by supplying malicious data, potentially delivered via S/MIME or CMS, causing the program to read beyond the allocated memory buffer.

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Impact Analysis

The heap buffer overread could lead to information disclosure or cause the application to crash. Since the vulnerability can be triggered by attacker-supplied data without requiring user interaction or privileges, it poses a risk of unauthorized data exposure or denial of service.

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Detection Guidance

This vulnerability involves a heap buffer overread in the wc_PKCS7_DecodeEnvelopedData function when parsing crafted PKCS7 EnvelopedData, potentially triggered by attacker-supplied data via S/MIME or CMS.

Detection would likely involve monitoring or analyzing S/MIME or CMS messages for malformed or crafted PKCS7 EnvelopedData that could trigger the vulnerability.

No specific detection commands or tools are provided in the available resources.

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Compliance Impact

The provided information does not specify how this heap buffer overread vulnerability in wc_PKCS7_DecodeEnvelopedData impacts compliance with common standards and regulations such as GDPR or HIPAA.

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